Make bugpoint ehpad/token friendly

Tokens shouldn't be blindly replaced with undef/null.  Also, don't try
to remove EH pad instructions from the top of basic blocks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252414 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed